package com.changgou.system.filter;

import com.changgou.system.util.JwtUtil;
import io.jsonwebtoken.Claims;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取请求对象
        ServerHttpRequest request = exchange.getRequest();
        //获取响应对象
        ServerHttpResponse response = exchange.getResponse();

        //判断当前请求是否为登录请求,直接放行
        if (request.getURI().getPath().contains("/admin/login")) {
            return chain.filter(exchange);
        }
        //获取当前请求头信息
        HttpHeaders headers = request.getHeaders();
        //获取jwt令牌
        String token = headers.getFirst("token");
        //判断令牌是否存在
        if (StringUtils.isEmpty(token)) {
            //如果不存在,则向客户端返回错误提示信息
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
//如果令牌存在,解析jwt令牌
        try {
            Claims claims = JwtUtil.parseJWT(token);
        } catch (Exception e) {
            e.printStackTrace();
            //令牌解析失败
            //向客户端返回错误提示信息
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //令牌解析成功,放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 2;
    }
}
